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Related Experiment Videos

Standardization of sonar cephalometry and gestational age

R E Sabbagha, M Hughey

    Obstetrics and Gynecology
    |October 1, 1978
    PubMed
    Summary
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    Existing charts for predicting fetal age using biparietal diameter (BPD) show significant variation. This study suggests a universal chart based on composite mean BPD values from multiple studies for more accurate gestational age prediction.

    Area of Science:

    • Obstetrics and Gynecology
    • Medical Imaging
    • Fetal Development

    Background:

    • Numerous charts exist for estimating gestational age via sonar biparietal diameter (BPD).
    • Significant discrepancies between these charts necessitate a standardized approach.
    • Fetal biometry is crucial for monitoring pregnancy progression.

    Purpose of the Study:

    • To investigate the reasons for variations in existing biparietal diameter (BPD) charts.
    • To evaluate the clinical utility of current BPD charts for gestational age prediction.
    • To propose a standardized method for sonar BPD utilization in obstetrics.

    Main Methods:

    • Analysis of 7059 biparietal diameter (BPD) measurements from four large fetal population studies.
    • Statistical comparison of BPD data obtained from B-scan, gray-scale, and real-time ultrasound.

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  • Development of a composite mean BPD chart.

    • Main Results:

    • Mean differences in BPDs across studies were not statistically significant from zero.
    • BPD measurements using B-scan are statistically comparable to gray-scale or real-time methods with medium gain.
    • Existing charts exhibit considerable variability in gestational age prediction.

    Conclusions:

    • A single, composite mean BPD chart derived from multiple studies is recommended for universal use.
    • Standardized guidelines for using sonar BPD in gestational age assessment are proposed.
    • The obstetrician's role in interpreting BPD data is critical for accurate fetal age determination.